Broaching machine



Dec. 12, 1944. w. D. AVERILL EI'AL BROACHING MACHINE Filed Feb. 20, 1941 5 Sheets-Sheet 1 Iz'a 7 ATTORNEY. I

4- w. D. AVERILL EIAL 2,365,040

BROACHING MACHINE Filed Feb. 20, 1941 5 Sheets-Shet 5 DMN Qw om.

. ure 7.

I of Figure 4.

Patented Dec. 12, 1944 William D. Averill and August L. Hamelberg, Cincinnati, Ohio, assignors v ing Machine Co., Cincinnati, Ohio, a corpora- ,tion of Ohio 22 Claims.

improved means in a breaching machine for automatically injecting and transferring. work among the-successive breaching stations.

A further object of this invention is to provide a duplex broaching machine which in a single cycle will efiect one breaching operation on two different work pieces and a different broaching operation on two other work pieces.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modifications may be made in a the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like refer- .encenumerals indicate like or similar parts:

Figure 1 is a front elevation of a broaching machine embodyingthe principles of this invention.

Figure 2 is an enlarged sectional view on the line 2--2 of Figure 1.

Figure 3 is an enlarged plan View with some parts in section showing the work supporting and transferring mechanism as viewed on the line 33 of Figure 1. V

Figure 4 is a sectional view'on the line 4-4 of Figure 3.

Figure 5 is a sectional view on of Figure 3.

Figure 6 is a view of a work piece that may be broached in this machine.

Figure '7 isa section on the line of Figure 1.

Figure 8 is a view on theline 88 of Figure 7.

Figure 9 is a view on the line the line s--5 99 of Fig-,

Figure 10 is a detail Figure 11 is a section on the line ll-ll of Figure 10..

to The Cincinnati Millview on the line Ill-l0 Application February 20, 1941, Serial No. 329,862

Figure 12 is a section on the line |2--I2 of Figure 3. 7 Figure 13 is a diagrammatic view of the hydraulic control circuit.

Referring to Figure 1 of the drawings, the machine comprises in general a base ill, a platform I .l as shown in Figure 2 on which the work supporting and clamping means are mounted, and a column I2 in which is formed dovetail guideways I3 as more particularly shown in Figure 3 for supporting and guiding a reciprocable ram l4.

As shown in Figure 2, the ram has a cylinder l5 formed integral therewith and containing a piston l6 which is operatively connected by a piston rod l'l to the top' of the column l2 as shown in Figure 1 whereby the piston rod is stationary and the cylinder moves with the ram. The piston rod is of double tubular construction having a central passageway l8, Figure 13, which communicates with the end of'the cylinder below the piston rod and a'second annular passage which communicates by means of radial holes 20 with the cylinder space above the piston. The passage i8 is connected by'a channel 2| to port 22 of a reversing valve 26 having a reciprocable valve plunger 2E. The space it is connected by channel 25, check valve 26 and channel 2i to port 28 of the reversing valve.

The check valve 26 has two check valve plungers 26! and 262 connected in parallel between ports 263 and 264 but opposite acting whereby when the pressure at port 264 is greater than the pressure at port 263, valve plunger 262 will open to permit admittance of fluid to the upper end of the cylinder to effect elevation of the ram. When the pressure at port 263 is greater than the pressure at port 264 plunger 262 closes, and plunger 26l opens to permit exhaust of fluid from the upper end of the cylinder during descent of the ram.

Attention is invited tothe fact that the spring .of plunger 26l is set to a higher value than the other plunger whereby the pressure created in channel 25 due to the weight *of the ram will not cause opening of the valve plunger 26 l thereby preventing the ram from dropping should the pressure in the system suddenly fail, or when the machine is shut down.

The reversing valve has a \pressure port 29 which is connected by channel 30 to the output of a pump 3| having an intake 32 through which fluid is withdrawn from a reservoir 33. The reversing valve also has a pair of exhaust ports 34 and '35 which are connected by a common reby channel 48 to port 48 of a relief valve essary for actuating purposes.

It should now be evident that when the plungtum channel 38 to the reservoir 33. It should now be obvious that when the'plunger 24 is in its left hand position as shown in Figure 13' that fluid pressure will be delivered to the upper end of cylinder l and that 'the lower end of the cylinder will be connected to reservoir whereby the ram l4 will move upward; and when the plunger 24 is shifted to the right, the port 29 will be connected to port 22, and port 28 connected to port whereby pressure will be admitted to the lower end of cylinder l5 and the upper end will be connected to exhaust, thus causing downward movement of the ram.

The shifting of reversing plunger 24 is effected I hydraulically and to this end the ports 31 and" 38 located at opposite ends of the valve housing 23 are connected by channels 39 and 40 to ports 4| and 42 of a trip operated pilot valve 43. This valve has a plunger 44 in which is formed a pair of\ annular groove 45 and 48 for alternately connecting ports 4! and 42 to an intermediate port 41. The port 41 .is connected automatic by-pass valve which serves as a start and stop valve. It has a chamber 5| which is always connected by ports 52 and 5: in series with the line 30, forming a part thereof. A plunger 54 spool 55 is slidably mounted within the valve and one end of the plunger is tapered at 56 to form a valve which closes the p0rt51. This port is connected byehannel 58 to the reservoir line 36. 'I'he spool 55 is provided with an axial passage 58 through which fluid flows from the chamber 5| to the chamber ill. The portion 8| of the plunger is smaller in diameter than the portion 62,

The-valve is an thereby providing a larger pressure area on the left side of the spool whereby when the pressure in chambers 5| and. 60 are equal, the end pressure on the left-side of the spool 55 is greater'than the total pressure on the right side which produces a force resultant which maintains the valve 5'! closed. If forany reason the pressure in chamber I drops to a point.that the total pressure on the left end of the spool is less than n on the right end, the valve will move to the left, opening the port 51 whereupon the pump will be by-passed to reservoir and the pressure in channel 38 will drop below that necer I4 is in a position to close the port 51 that n the unit pressure in channel 48 will build up equal to pumppressure and therefor the port 41 ofthe pilot valve 48. will be a and will thus deliver fluid for actuation of the I to port 41 which will flow through channel to the'right hand end of the reversing valve housing 23 and shift the plunger 24 to its'left hand position.

. In order to make tie! in chambers land II of the 'by-pass valve, the portion 8! of the plungerextends into a bore 03, and to prevent the creation of vacuum or excessive high" pressure from interfering with the movement of the is drilled through the v of the plunger to establish constant communication with the return line 58, thus breaking any vacuum which might form, ordraining on any fluid that might accumulate in the end ofthe bore through leakage.

The work piece to be broached by this mapressure port having enlarged chine is indicated by the reference numeral 45 in Figure 6 and is made up of various cylindrical portions, the portions 66 and 61 of which have flats 68 and 69 to be broached on opposite sides thereof, and an enlarged spool portion 10 is to have four longitudinal grooves 1| broached in the periphery thereof and equally spaced thereabout.

The machine is a duplex machine and is provided with means for handling twoof these work pieces at the same time for each operation. To this end a right and a left hand hopper l2 and 13 are provided, as shown in Figures 1, 3 and 7, into which the work is loaded by the operator. These hoppers are provided with work receiving grooves 14 which are enlarged to receive the enlarged spool 10 of the work piece. The work is loaded in the hopper so that the end portions 66 extend in opposite directions as shown in Fig-' -A work injector slide 19 has an upwardly extending lip 80 which. when the slide is in a re.- turned position restricts the passage of work through the throat 16. As the slide 19 advances and the lip moves forward, or to the right, as viewed in Figure 2, a work piece is permitted to advance into the vertical passage ll of the hop- -per but isheld in that position by the fiat 8| formed in the slide 19. When the slide returns possible a pressure difieren plungenasmall axial bore 84 again, the work piece that is in the vertical passage rides over the lip by virtue of the recess 18 and falls upon the work support 82 while the lip engages the next workpiece and prevents it from falling. Thus, only one work piece is delivered to the work support 82'for each reciprocation of the work injecting slide 19.

The work injector slides are supported on a pair of pins 83 and 84 which are spaced longitudinally of the slide. The pins are fixed, while the slides are provided with slots 85 and 86. The.

slot 85 extends parallel to the axis of the slide throughout its length, while the slot 88 has a cam surface 8'! for depressing the end of the slide about the pin as it moves forward to push the work piece into the work holding groove 88.

Depressing the rear end, elevates the front end of the slide as the work piece drops into the groove so that the front end will ride over the 'top ofthe work piece and eventually act as a clamp'to hold the work piece in the groove 88. 7

Both slides are moved simultaneously by a bell crank which rotates about a fixed pivot 94 and has arm bifurcated at 8L for engaging grooves 92 formed'inopposi'te sides of a recipro: cator 93. As shown in Figure 3 the upper end of the bellcrank is provided with a pivoted equalizer lever 94 having ball-shaped ends 05 which engage slots 98 formed on the underside of the injector slides 18. Spring pressed plungers 8'! are mounted in the endof theslides 19 and exert continuous pressure on the ends of the equalizer 94. Thus as the bell crank is rotated in a clockwise direction, as shown in Figure 2, the

spring pressed plungers, .1 provide the necessary clamping of one piece does not interfere with the proper clamping of the other.

The broaching tools for operating on the work at the first broaching station are mounted in a block 98, Figure 3, which has a dovetailed guide 99 by which it is clamped to the broaching ram I4 by the clamping members I00. This block has two longitudinal grooves IOI and I02 and the broaching tools are mounted on the sides of these grooves.- There is a first set of broaching tools I03 and I04 in the groove I02 and a similar set in the groove ml for broaching the flat surfaces 69 on one end of each work piece, and pairs of tools I05 and I06 mounted in the respective slots for breaching the'flat surfaces 68 on the other end of each work piece. One set of these latter tools is shown in Figure 2 and it will be noted that they are clamped into position by clamping bolts I01 after being properly spaced apart by adjustable gibs I08 and I09. The same means are utilized for clamping the other setsof broaching tools in the various grooves.

The power actuated reciprocator 93 is guidedfor vertical reciprocating movement by spacedsleeves IIO and III, and operatively connected.

by an arm II2 to a piston rod II3 of an air operated piston H4. The piston is contained in an air cylinder II5, the opposite ends of which are connected by pipes H6 and H1 as shown in Figure 13 to ports H8 and H9 of a reversing valve- I20. This valve has a plunger I2I which is shifted by a dog-actuated crank I22. The plunger h'as annular grooves I23 and I24 for alternately connecting a pressure port I25 supplied byconventional means with a compressor indicated by nuthe port 41 becomes interconnected with the port 4|. This would potentially effect the shifting of i the reversing valve plunger ;24 but the channel 39 through which the fluid would flow from port III to port 31 of the reversing valve has a branch line connection I41 to port I48 of an interlock valve I49. This valve has a rotatable plunger I50 in which-is formed a groove I5I which at this time is positioned to connect the port I48 to exhaust port I52. This exhaust port connected. by channel I53 to the reservoir 33.

Thus; the immediate efiect of shifting .the pilot valve plunger is to connect the chamber-:60- of the by-pass valve 50 to reservoir which re- .duces the pressure in that chamber sufiiciently to permit the pressure in chamber 5I to shift the plunger 55 to the left, thus opening the port 51 whereby the delivery of pump3l is by-passe'd to reservoir through channels 58.and 36. This results in a loss of pressure for. ramactuating purposes whereby the ramwill stop.

While the ram is being stopped by the method just explained' the air piston H4 is continuing its downward movement, rotating thebellcrank meral I to ports II8 and H9. The crank I22 has radially extending fingers I26 and I21 which lie in separate planes for engagement by trip dogs I28 and I29.

The valve I20 has a pair of ports I30 and I3I which are connected by channel means I32 to a mufiler I33 whereby when these ports are alternately connected to ports I I8 and I I9 respectively the high pressure air being exhausted from the cylinder II5 will be delivered to the muilier, thereby insuring quiet operation of the machine.

The dogs I20 and I29 which operate the reversing valve for-the air cylinder are pivotaily mounted upon the end of adjustable support bars I34 and I35 as more particularly shown in Figures 8 and 9. Referring to Figure 8, the dog I20 is pivotally mounted on a .bolt I36 and is provided with 9. lug I31 which prevents counterclockwise rotation of the-dogby a spring I38, thus holding the dog in the proper position for actuation of the crank I22 upon downward movement of the ram. During upward movement of the \ram the dog is free to be rotated clockwise, thereby snapping by the crank without operating. it.

The dog I29 is similarly pivoted on -a bolt I39 on the support I35 and is held against counterclockwise rotation by a lug I40 against the action of a spring I. dog I29 is mounted so as to be efiective during upward movement of the ram and ineffective during downward movement of the rain.

The supports I34 and I35 are mounted on a T-shaped bracket I42 which is attached to the ram as shown in Figure 1. The supports have elongated slots in and I44 respectively by :whichthey may be adjusted relative to fixed'clamping bolts I45 which are threaded in the bracket I42. This makes it possible to adjust the length of the ram stroke and also the zone of movement ofthe ram.

It will be noted that the 89 to insert and clamp a new work piec th work receiving groove 88. Simultan sly a work transferring mechanism which had picked up the partially finished work piece from groove 00 at the end of the downward stroke of the broaching ram in a manner to be explained later loads this work'pieceat a second breaching station'located at the mouth of tunnel breaches indicated by the referencenumerals I53v and I54 in Figures 3 and 4 of the drawings.

Oscillatable transfer arms I55 and I56 serve to carry the workfrom one breaching station to the next. These arms are normally held in the intermediate position in' which they are shown in Figure 4 by similar centralizing mechanisms, 4

one ofwhich is shown in-Figure 12. v

Each arm has a boss I51 by which it keyedito the end of a shaft I 58. i The shaft is rotatably supported in bearings I59 and I60. .Rotationof the shaft is effected by an arm I6 I which is bolted at I62 -to a yoke I63 fastened to the upper end of the rod 93 as more particularly shown in Figure 4. The arm IBI has a cam surface I64 which -.is adapted to engage a pin I65 projecting later ally from a crank I66. The crank is releasably connected to the shaft I58 by a spring pressed bal1'I61 engaging a V-shaped groove I68 formed in the shaft. Should the arm I55 become caught I for any reason, the connection will yield so as to prevent damage to the-parts.

When the actuating rod 93 is-moved downward by the piston N4 the cam surface I64 engages the pin I65 and rotates the arm I55 into a vertical position for transfer of the work to the second broaching station. The arm I6I moves down sumciently .to clearthe' pin I65 whereby the arm is free to be returned to its intermediate position. This .return movement is eflected by a l spring I65 as shown in Figure 12 which has one end I10 attachedto a fixed support III and the other end attached to the end of a pin I12 which is threaded radially into a disc I13 keyed at I14 to the shaft I58. To insure that the arm I55 vided with an intermediate and is frictionally clamped to the shaft channel I98 to the line assumes a definite position 'a spring pressed deformed in the periphery of the disc I13. As the plunger 93 completes its downward movement it rotates the interlock valve I58 into a position toclose port I48 and thus close theby-pass to reservoir from the relief valve 58. As shown in Figure 4, the rotatable valve plunger I58 is provided with a pair of radially extending fingers I18 and I19 which lie in different vertical planes and which, in addition, are circumferentially spaced from one another. 1 A trip lever I88 is pivotally supported on a shaft IN and is proball-shaped portion I82 which fits in a cam slot I83, Figure 2, formed in a plate I84 attached to the bracket II 2.

As'previously described, the bracket H2 moves with the piston rod I I3 whereby the plate I 84 will move up and down with the piston rod. It will be noted that the cam groove I83 has an inclined surface I85 which as it comes into engagement with the portion I82 will cause rotation of the trip lever I88 and thereby rotation of the valve I58.

'I'heair piston II4 has now reached the end of" its downward stroke; effected presentation of new work pieces at all broaching stations; and has positioned theinterlock valve so as to close the by-passfrom channel I41 to reservoir whereby pressure builds up inthe system to shift the reversing valve. Attention is invited to the fact that the transfer arms I55 and I58 are not released by the cam I84 until practically the finish of the stroke of the air piston I I4, and then they are returned to their intermediate positions by independently operating means such as the springs I68.

To insure that the transfer arms have been returned properly by the springs I69 additional interlocking means are provided comprising twointerlock valves I88 and I81 which are associated with the respective operating shafts I58. One of these valves, I88, is shown in Figure 4 and comprises a plunger I88 which is continuously urged upward by a spring I89 into engagement with the periphery of acam I98. 'Tlie cam is split at I9I I58 by a set screw I92. The cam for the other in the diagram in Figure 13, and it will be noticed that these cams are provided with fiat surfaces I92 and I99 respectively, the surfaces being of pushes the workpiece,

operating arm is indicated by the reference numeral I9I' opposite hand because the arms move in opposite directions when transfer'ring work to the tunnel broaches.

The valve I88 has a pair of ports I94 and I98 'while thewalve I81 has a pair of ports I98 and I91. The ports I94 and I98 are connected by a 48 while the ports I95 and I91 are connected by channel means I99 to the exhaust line I53. Each plunger has a groove 288 and a spool 28I and in the normal position of the plungers the I94 and I 98.

In this position of the parts there isno by-pass spools 28I closethe ports from the channel 48 to reservoir but upon counterclockwise rotation" of the cam I98 and clockwise rotation of the cam I9I", the plungers are depressed so that the grooves 288 eilect parallel connections of the line 48 to reservoir by inter- ;connecting ports I94 and I95 of one valve and ports I98 and.I91 of the other valve.

This insures that the line 48 which is to supply the operating pressure for shifting the reversing valve is by-passed to reservoir until both of the .toward the finger 282 to the work support 88 the the transfer arm moves face 289 acts as additional insurance against the an unloading finger their intermediate position; When this has been accomplished, the valve 58 closes, building up operating pressure for actuation of the broaching ram as well aspressure for shifting the reversing valve, whereupon the reversing valve is shifted and the broaching ram starts its downward stroke.

Each transfer arm is provided at the end with a pair of work engaging fingers 282 and 283 as shown in Figure 10, the finger 282 being fixed while the finger 283 is pivoted on a spring member 285 tends to urge the finger 283 provide a friction grip on the work piece 68. It will be noted that the ends of the fingers are beveled at 288 whereby upon downward movement of the arms toward work piece will be guided between the fingers and frictionally gripped thereby. The opposing faces 281 and 288,'Figure 11, on the fingers engage the newly formed flat surfaces 89 on the work piece while a beveled surface 289 on the finger 283 engages the edge of the spool 18 on the work the same into contact with a shoulder 2). As

upward the bevel surwork piece, dropping out of the grip of the fingers.

Referring to Figure 5, each transfer arm has 2 pivotally supported by a pin 2I2 between the work gripping fingers. The work engaging end of this finger is held out of engagement with the work by a sprin Dressed plunger 2I3 which is mounted in the end of the arm. As the arm swings over the tunnel broach an arm 2| 4, which is integral with, the finger and engaged on one side by the spring pressed plung- ',er 2I8, hits a fixed abutment 2I5 whereby the finger is rotated in a clockwise direction which downward and outoi engagement with the work engaging fingers and into the mouth of the tunnel breach.

In the mouth of this broach there are pivoted a series of work receiving members2l8 which are shaped in the form of a bell crank and urged counterclockwise by spring pressed plungers 2".

The plungers urge these members toward the.

center of the tunnel, thereby holding the work from dropping into the tunnel. After the transfer arm has discharged a work piece into the tunnel it returns to its intermediate position as previously explained while the work piece is supported by the members 2| 8. The tunnel broach is provided with a series of broaching tools 2I8, the number depending upon the number of grooves to be cut in the periphery of the spool 1I. These tools are clamped .in radial slots 2I9 by set screws 228 and are radially adjusted by a series of adjusting bolts 22I which engage the back of the broaching tools.

As the broaching ram moves downward a pusher rod 222 supported in alignment with each tunnel broach by the yoke I42 engages the top of the work pieces and forces them through the tunnel broach, the work supporting members 2l8 yielding under the pressure to permit the work piece to pass through. The work is pushed through the tunnel sufllciently to clear the end of the broaching tools so that it may drop by gravity into a work receiving chute 228 as indicated in Figure 5 of the drawings.

pin 284. A'

piece, thereby urging been completed, the latch deg I28 engages finger V I21 of the air valve operating crank, shifting. the plunger 'I2I into a position to effect upward movement of the air piston Ill. The piston ef- ,fects counterclockwise rota'tion of the bell crank 89, thus retracting the 'slide 19; counterclockwise rotation of the work transfer arm I55 and clockwise rotation of the work transfer arm I56' to pick up the work pieces at the firstbreaching station: and effects rotation of the trip'lever I80 by engagement of the cam surface 224 in the slot I83 with the ball I82. This rotates the interlock valve I49 into the position in which it is shown in Figure 13. Thus the port 225 is closed again whereby uponsubsequent shifting of the pilot valve plunger 44 by trip dog 226 carried by the breaching ram, fluid pressure may be delivered to the right end of the reversing valve housing 23 toshift the plunger 24 into a posi-,

tion te-effect upward movement of the breaching ram.

This will, of course, be permitted if the work transfer fingers have completed their return movement to their respective intermediate positions so that the interlock valves I86'and I81 are closed. The breaching ram will now return operable control lever 234 into a position to interconnect ports 228 and 229, thereby bypassing channel 48 to reservoir, shifting valve plunger asst 5340' v at the second station from the machine, and

means operable between breaching operations to transfer work from. the first station to the second station. v I

3. In a breaching machine having two breaching stations for sequentially periiorming different breaching operations on a sin le work piece, the combination of means for transferring work from the first station to the second station including an escillatable arm, work gripping means in one end of the arm for. gripping a work piece when swung to the first station, and abutment means at thesecond station and automatically operable for releasing said work gripping means when the arm is swung to the second station causing the work to drop into breaching position at the second station. a

4. In a breaching machine having two broaching stations for sequentially performing different breaching operations on a given work piece, the

combination oi a. work transferring arm oscillatable between saidstations for conveying work from one station to the next, said arm having an intermediate position, detent means for holding the arm in said position, power operable means for alternately moving the arm to the 'respective stations and resiliently operable means for returning the arm alter each movement of its intermediate position.

54 into a position to bypass the supply pump 3| to reservoir which will lower the pressure in the supply line below that necessary for operating purposes.

' There has thus been provided an improved tomatically and sequentially perform diiferent breaching operations on a single work piece and having means for automatically feeding the work to a first breaching station, transferring work to automatic breaching machine which may be censtructed as a duplex machine and which will aua second breaching station and automatically ejecting the finished work from the machine.

What is claimed is:

1. In a breaching machine having a first breaching station and a second breaching station, the combination of a ram, means carried by the ram to efi'ect a breaching operation simultaneously on a work piece at each station during advance thereof, a mechanism for automatically removing the broached work piece from the first station after the advance stroke of the ram, and means to, return the ram and cause said mechanism to deliver the broached work piece to the second station for another breaching operation during the next advance stroke of the ram.

2. In .a breaching machine,. .the combination of a first broaching station having means for receiving and positioning work for a first broaching operation, a second breaching station having means for receiving work from the first station and positioning it for a second breaching opera tlon, means for simultaneeusly-broaching the work at each station and ejecting work finished 5. Ina breaching machine having two broaching stations and a power operable ram for effecting simultaneously breaching operations at each station, the combination of a source of power for energizing said power operable ram, a transfer mechanism for conveying work from the first station to the secondstation and interlock means rendered effective by said mechanism during operation thereof to inefiectuate said source of power for ram operating purposes.

6. In a breaching machine having'two broaching stations and a fluid operable ram for effecting a breaching operation simultaneously at each station, the combination of a source of fluid pressure for energizing said ram, a transfer mechanism iorremeving a workpiece broached at the first station to the second station for a subsequent breaching operation, and interlock valve I means responsive to operation of said mechanism for rendering said source of pressure ineffective for operating said ram.

7. In a duplex breaching machine, the cembi- I nation of a first pair of breaching stations, each adapted to receive a rough work piece, a second pair of breaching stations adapted to receive work transferred from the respective first stations, a pair of work transferring arms for operating between respective sets of stations, a fluid operable rain for eflecting breaching operations simultaneously at all stations, 9. source of fluid pressure for said ram, a control valve shiftable to render said source of pressure inefiective for rain actuating purposes, and interlock means controlled bysaid arms to shift said valve during movement of the arms whereby the ram will not be moved during work transferring operations.

8. In a broaching'machlne having a breaching station, a breaching ram movable with respect to said station on a cutting stroke to broach'the work piece, and on a return stroke, a retractable arm automatically operable after the breaching j stroke to-pick up and remove the breached-work termediate said stations,

.with the second breaching means, and means operable simultaneously with the first breaching means for effecting relative movement between the work piece and the second-named breaching means to effect a second breaching operation on the work piece.

=10. In a breaching machine, the combination of a first, breaching station, a second breaching station, acommon actuator for effecting broachhopper overlying the work support, said work support having a work receiving depression formed therein for holding work during broaching, a work injector slide reciprecable between the mouth of the hopper and the depression, means on the end of the slide limiting the escape of one work piece at a time from said'h'opper, means to reciprocate the slide; means pivotally supporting ing operations simultaneously at each station,

means to transfer work from one station to the other including a movable arm, mean in the end of the arm for gripping a work piece, means to swing the arm to one station and return during one stroke of the actuator, and means to. swing the arm to the other station and return after the next stroke of the actuator.

' ll. In a breaching machine, the combination of a first breaching station, a second breaching station, an actuator for effecting a breaching operation at each station simultaneously, means to transfer work from one station to the other whereby successive breaching operations may be performed on a single work piece including a transfer arm, means normally holding the arm in an intermediate position, means operable after eluding means to clamp the work to the fixed one stroke of the actuator for causing said arm to remove the broached piece from the first station, means operable after the next stroke of the actuator for moving the arm to the second station, and means at the second station for automatically releasing the work piece from the arm.

12. In a breaching machine having two broachlng stations for sequentially performing diiferent breaching operations on a givenwork piece, the combination of a. work transferring arm oscillatable between said stations for conveying work from one station to the next, a shaft for supporting said arm and imparting oscillation thereto, power operable means for imparting a rotary movement to said shaft anda releasable connection between said arm and said shaft to safeguard against damage to the parts. a

, 13. In a breaching machine having two breaching stations for sequentially performing different broaching operations on a given work piece, the combination of a. work transferring arm oscillatably mounted .for conveying work from one station to the next, a shaft supporting said arm, a yieldable connection between said arm and said shaft, detent means associated with said shaft for normally holding said arm in a position ina fluid operable piston for positively-imparting motion to the arm to causemovement thereof from the intermediate position to either of said breaching stations and resiliently operable means for returning the arm from either of said breaching stations to its intermediate position.

14. Ina breaching machine having a work support, a reciprocable ram, and breaching means carried by the ram for breaching work mounted on the support, the combination of means for positioning and clamping the work 'including a the slidefor oscillation in a plane perpendicular to the support, and means 'to oscillate the slide in timed relation to it's reciprocation to effect elevation oi the work pushing end as it approaches the depression whereby said end will ride over the top of the work as it drops into said depression, and means to oscillate the slide in the opposite direction to clamp the work in the depression.

15. In a breaching machine having a work support and a reciprocable ram movable in a plane perpendicular to the support, the combination of means for shifting work pieces to a first breaching station on said support and clamping the same, breaching tools carried by the mm for breaching a series of fiat. surfaces on the work piece, a second breaching-station having a statienary set of breaching tools extending parallel to the movement of the ram, means to transfer the work from the first station to the second sta tion, and a plunger carried by the ram for forcing theworkpiece past the stationary breaching toolste form a plurality of longitudinally extending grooves in the periphery of the work piece. I

16. In a breaching machine having aflxed support and a reciprecable support, the combination L of means forming a first breaching station in- 0 breaching station including a plurality of breaching tools secured to the fixed support, a plunger carried by the reciprocable support for forcing through the work past the fixed tools, and means totr'ansfer work from the first breaching station tothe second breaching station.

17. In a breaching machine having a fixed support and a reciprocating support, the combination of means forming a first breaching station including means to rigidly clamp a work piece to the fixed support, breaching tools carried by the reciprocating support for breaching the clamped Work piece, means forming a second breaching station including a plurality of yieldable work supporting members, .means to transfer work thereto from the first station, a plurality of fixed breaching tools located beyond said work supporting members, and means carried by the reciprocating support for shifting the work through the yieldable members and past the stationary breaching tools simultaneously with the broaching operation at the first station. I

18. In a breaching machine having a fixed support and a movablesuppert, the combination of means for breaching. a plurality of longitudinal extending splines in the periphery of cy including a plurality of radially arranged spline breaching tools, a plurali e1 resilient work supporting fingers equally spaced about an axis passing through the center of 'said breaching tools and a plunger carried by the movable support for forcing the work said fingers and past the tools, said work dropping by gravity out of "the machine after the breaching operation has been com-'- p eted.

19. In a breaching machine having a fixed support and a movable support, the combination of means forming first and secondbroaching stations on the support, an oscillatable transfer arm for transferring work pieces broached at the first station to the second station including a plurality of resiliently operated work grippers for frictionally engaging the work, a work releasing member carried by the'transfer arm, means at. the second station for engaging and actuating said release member to disengage the work from said grippers.

20. In a broaching machine having a fixed support and a movable support, the combination of means on the fixed support for forming two,

broaching stations, a ring work from the first station to the second station, fluidv operable means for reciprocating the movable support and causing simultaneous breaching operations at each station including a fluid control circuit, and control valve means,

in said circuit and responsive to the position-oi said transfer arm for rendering said circuit ineffective for broaching purposes during movement of the transfer-arm for work transferring purposes.

21. In a breaching inachinehaving a fixed support and a. reciprocable support, the combination of means forming a first breaching station on the fixed support, breaching means carried by the reciprocable support for broaching work at said first station, a second broachin transfer arm for transfer- I said arm for return by said spring. WILLIAM arm in one said loader and transfer mechanisms, a separate hydraulic circuit having a source of pressure for actuating the reciprocable support, -a bypass valve in said circuit, and means operable by said piston for opening and closing said valve for controlling the pressure in said operating circuit. I

22. In a breaching machine having a support and a reciprocable broaching ram, the combination of means for supporting work in alignment with said ram, a work receiving hopper carried by the support, a work injector slide for moving work from the hopperto the work supporting means, a bell crank for oscillating said slide, an oscillatable arm having means tor gripping and removing work after the ibroaching operation, spring means normally holding said arm in a neutral position, a, reciprocable piston,

means operatively connecting said piston and bellcrank, and other means operable by the piston for causing positive oscillation of said direction during one direction of movement of said piston, said means releasing D. AVERIIL. AUGUST L. HAMELBERG. 

